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Finding the Fourth Proportional to 57,720.80, 86,581.20 and 56,943.20

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Solution

The fourth proportional to 57,720.80, 86,581.20 and 56,943.20 is: 85,414.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,720.80 : 86,581.20 = 56,943.20 : x
  2. Step 2: Convert to fraction form
    57,720.80/86,581.20 = 56,943.20/x
  3. Step 3: Cross multiply
    57,720.80x = 86,581.20 × 56,943.20
  4. Step 4: Simplify right side
    57,720.80x = 4,930,210,587.84
  5. Step 5: Solve for x
    x = 4,930,210,587.84/57,720.80
  6. Step 6: Final answer
    x = 85,414.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.